Safety operating mechanism.



E. M. HAWKINS. SAFETY OPERATING MECHANISM.

APPLICATION FILED SEPT, 19. 1914. 1,296,798. Patented Mar. 11,1919.

" 2 SHEETSSHEET 1.

i. HAWKENS.

SAFETY OPERATING MECHANISM.

APPLICATION FILED SEPT. !9. I914.

2 SHEETS-SHEE1 2.

5 Woe M5040 mam-n:

ITED STATES PATENT ()FFICE.

EDGARJIL HANKINS, OF ROCHESTER, NEW YORK, ASSIGNOR T9 M. D. KNOWL'I'ON CGMPANY, Q1? ROCHESTER, HEN YORK, A CORPORATION (3F NEW YORK.

SAFETY QPERATING MECI-IANI3M.

Specification of Letters Patent.

Patented Mar. 11., 1919.

Application filed September 18, 1914. fierial No. 862,480.

- Rochester, in the county of Monroe and tate of New York, have invented certain new and useful Improvements in Safety Dpcrating l /lechanisni, of which the foilon Jog-is a SPQClivQhlOil il he present invention relates to that type of safety devices for prose chines, be): staying machine and the like. intended to transmit power from the actuating means to the work-performing ele ment only when the same is in closeproximity to the work to be operated upon. At all other times, the work-performing element will yield if" it meets with an obstruction, such as the operators hand,- and, therefore, no harm will be done.

The object of this invention is to provide a safety device or safety operating mechanism of this kind having the improvelnents hereinafter set forth.

The invention is illustrated in the accompanying drai'vings, whici show the safety operating mechanism applied to a box-staying machine. but it will be obvious that may be used on other, types of machines as Willi.

in the drawings Figure 1 is a front elevation f a p -L1 1; of a hex staying machine, certain parts hebroken away to show the safety operatmg mecl'ianism;

Fig.2 an enlarged view of the safety opcrating mcclmnism showing the parts in the position which they assume uat prior to the engagement of the work by the work performing elemc-nt;--a1ul Fig. 3 is a vertical section taken onthc line 3-43 of Fig. "2.

' The box staying machine illustrated in thc drawin s is of the usual unis-traction. and comprises movable die A and a stationary die or anvil l). The movable die A is carried by a reciprocating slide (1 providcd with a rca '\-ardl v projecting pin "1). This pin is conu'eclcd to and driven by the actuating shaft l). which. in theprcscnt iustancc, is provided with a crank pin 'lhc crank pin F in conucclcd with the pin l) by a hnk or pilinan construction, which 15 constructed in the novel manner hereinafter described 5, punching 1na-.

to constitute the safety device or safety operating mechanism hercinhefore referred to.

The safety operating mechanisn'i or safety link comprises two power transmitting elements, one of which is indicated at l, and is journaled on the crank pin F, and the other is shown at 2. and is pivotally connected with the pin 1). 'A. biiishing may be interposed between the pin 1* and the part 1 and similar bushing l interposed between the pin D and the part 2.

The depending power transmitting: cicinent 1 has a l;=i.furcat(x.l lower extremity for iing an cloiwated opening 5. in which The pin 1) ring-a v 4 and in which it is freely slidahle. The parts and are connected by means of a pin (5 SOCHl'Bd in the part 2 and engaging in an opening 7 in the part 1, preferably having the shape shown in Fig. 2. An enlarged head 8 on thepin 6 overlics the face of the part. '1, and serves to hold the parts 1 and 2 together.

The depending powcr transmitting element 1 is provided with a shoulder S), which is adapted to engage with a corresponding shoulder 10 formed on the power transmitting, clement The parts are yieldingly held in the position shown in Fig. 2, in which the shoulders S) and 10 are in engage ing relation, by incaus oi a spring ll. having one o;- morc convolutio'ns wound around the. hub of part 2, and having one of its ex" treniities secured to the part land the other extremitv sccurcd to the part 2. A suitable stop 12 may bc provided for limiting the movement of the part2.

An extension of thc pin 1 is fornmd into a cam 13. and is so shaped that just altr the movable die A leaves lhc work on the up stroke of the sa'tctfv link. the part 2 will be shifted to the position shown in Fig. 1. in

which the shouldcre S) and it are outof mic-aging -clatiou.

The cam 12-; holds thc part 2 in this position during the up and down stroke of the link until the movable dic A. or \vmk-performi11g clcmcut. is about of au inch from the work to be operated upon. At this timc. the cam assumcs the position shown in Fig. 2. and pcrmits the spring 11 to Hhit't the part 2 to the position shown in Fig. '2. The shoulders f) and 10 are lhcn in engaging relation. and 'm'cssurc is transmittcd vfrom the crank pin F through tho parts .i and to the pin I), thc sanio as if a solid iirl; were provnloii bcl'nccn. lln! pins if the Work-performinn olcincnl. which, in the prcsent instanco. is the movable die A, GI'IIEOUUHWJS any obstacle duringits down- Wa rd movonicn'r, such as {tho opcrai'iofs hand. the parts 1 and 2 will yiold or. more i-cla-- tivo to each other, sincetho pin l) and part" 2 will bo hold stationary by lhc obstaclo, and as the shoulders SJ and 14) arc not. in engaging; relation, the part i and crank pin F wili continue their downward loom moot wilhonli applying any pressure to rho workperforming element. Tho opci'iing's i' and 5 permit this relative movement bciwocn the parts 1 and 2, and allow tho part i to main; its downward stroke without affecting the part 2 which is bring hcid stationary by the ()lISlTiUjflG under the work-p0riorining ohmenh Whon. an olisl'aclc is so incl. with, and. the, parts more relative to each other, as j 11st described, the nppor extremity of the part 2 will be thrown to one side of the cam 13, and.

ixho cam in descending will morn flUVVIlWilNl relative to the zipper and of the part 2, in. an obvious manner.

(,lbvionsuf any ohstrnoiiimi over i of an inch in thickness will cause lilo parts to col lapse or more. relative to each other horn dies nhcd, since the shoulders 5) and. 10 are not in engaging relation at any time, until tho Work niorndug element is 1- of an inch from the "work to be opcratcd upon. When the sh ulcers 5 and. i0 are not in engaging rchitii" no pressure will he appiicd to tho lc under the work:-pcrforming' eloni iii, and, li'licrnforo, tho opcraiofls hand, ii. accidentally caught bci'wccu the dies, will bo uniiiijnred hai l oiaiin is:---

i, In a, maithinu oi the kind described, the combination. with the actuating means and a w nkpcrforniing '.\l(:llii:l'll,, of a normally ii'a'iporaiire poocr-1ransiiiil'ting element pi votall assoc aicd with tho wovhpcrforming olcnmnt, and. means ass 'riatcd with aniiactuatcd by the actuating incans automatically operable just prior to the engagement of the work by the work-pcrforming element to permit said pone shift to its opcrat position,

In a machinn oi the kind described, (the combination with the actniiiing means and a work-performing (elem-ant. of a normaliy inoperative nmvcr transinii'l'ing oicincnt pirmany associatod with (in: workperforming element, and a cam aseaniialzod with the in tuaiiing incansand opoi-al'rin just prior to the ongagomonr, of the work by the work performing clemcntito permit said oowcr iransmitting element to shirt to its opcrativposition. I 1 q in a machine of ih Limo. (irnwriocit, llllflmlllblllailiqll with tho work-pollen:un s

1 'ansmitiing clement to ar l'ualing moans, and a cam assmiatcd. with llio actuating moans to permit that lcn'icnt' which associated with the work-performing clement to shift to ils operative position just prior to the (engagement of the work by establish a positive comicctimi 'octwocn the two 1)()Wl.l'--l;lilIlSllllllillg elcmonlis.

l. In a machine of the kind dwcribod, the combination with tho actuatiin; eccentric and tho \\'|.nl -1nnfm-niing clcmont, oftwo powertransmitting vlonn'nts onc boinn inountml on the eccentric and the other sociatcd with the work-pcriorming element, and 'iosilirely-acting controlling means normally maintaining aid power transmitting elements in inoperative relation and openzlblo to permit of their assuming operative relation to each other just prior to the engagement of the Work by the work-performing clement.

5. In a machine of the kind described, the combination with the actuating ooccntric and the Work-p0rforming element, of two power" lransmitting elements one being mounted on the eccentric and tho other associulrd with the \\'oi'l --]liq-forming clement, said iowor-transmitting c-lcments provided with shoulders adapted to engage in trans iuitpoivvr from the actuating moans to the \\'orlc- )crfol'ming clonioni'r and posi ivciyacting controlling moans normally maintaining said power-{Iansmiiling oloiacnls in inopcralaivo rcla'l'ion with their shoulders out of engagement with each other and oncrablc to permit of their assuming o mratiro relation with their shouldcrs in engagement, just prior to the engaglanont of the work by i. In a machine of tho kind doscri 'iod, tlna combination with the actuating means. and a worlcperforlning; clonicnlf, oi a normally inoperative poWcr-transmiiting clement pivofally associated with tho work-performin clement, means tending to yieldingly holc said power-transmitting element in its op erlit lve position, and a cam associated with tin": actuating r'nenflllfl ,Iontml the movelnrnt of said )0WbiP'-tfllnsmitting clerncnl; and opurahlo just prior to the cngilgmmenl; of tho work by tho work-performing elmjnentw to permit lhc power-transmitting clemenf m l cshiftod by said means to its operative posllion. v I

7. in a machine having a work-performin; clement and an actnating eccentric, a iszzii'oty-link connecting: the sameand comprising two parts for transmittingmowcn to the work-perfonning element, one of said parts being connecwd to tho acwatinq' m y ccnirio and the other to the work per omil'ho work-performing element. and tiici'oliiy llll 1 ii ii transmitting power,

ing element, controlling means carried by said eccentric for normally maintaining one of said ports in inoperative relation to the other and operable to release the some just prior to the engagement of the Work by the Work-performing element, and means automaticeliy operable to'shift said port to operative position relative to the other following its Safety operating mechanism for the Work performing-element of machines of the kind described, including a safety link comprising two relatively slidzible portions normally held inf en inoperable position for and automatic means for shifting the position or" one'ofi the parts to permit said parts to contact the same efiective for transmit-ting power, just prior to the engagement of the Work by the work-performing element,

9. Safety operating} mechanism for the Work-performing element of machines of the -r' id described; including a safety link comprisingiwo relatively slid-able portions, it com for normally holding one of the portions in an inoperative position for receiving power from the other portion, and a. spring for shifting the position of the com-held portion. when released by the com to permit the two portions to contact and thereby ren' der the some effective for transmitting; power, seic coin adopted to release the portion held-by the some jusprior to the en gegement of the Work by the Work-performi113; element.

10. Safety operating; mechanism for the work-performing element of machines of the iii :1 described; including a safety link comprising two'i-elotivcly slidoble portions provided. with shoulders 'edeptedto directly engage eac'i'iother when said portions are in their operative poeition.. and means to control the relative sliding movements; of said portions so that said shoulders will antornetically engage nt'e predetermined point during the operative movement of the link and prior to the engagement of thewerk by the Work-performing element.

11. In a machine of the kind described the combination with the actuating eccentric pinv and a pin associa ed with the work-performing element, of e normaliy inoperative power-transmitting iember pivotally essecinted with one of said pins and extending to the other, and a cam associated With the actuating eccentric pin normally operative to -innintain said power transmitting element in an inoperative position. but automnticaliy operable just prior to the engagement of the work by the v:writ-performing element to permit said power-treusrnitting" shift to its operative position.

incrnber to machine or the hind (IGSCi'lllBd,

the combinati-zm with the actuating" eccentric and the work-perfornii11g element, of two release 0 said controllin means.

and render norlnullyiiiopcrul'i vc power-truusmitting clcand the other ussocietcd with the work-performing clcn'icnt, and means automatically operable just prior to the engagement of the work by the \vork-pcr'loriui-ug clement to shift one of said 'elcincnts to establish .1 positive connection bctwccn the two.

13. in u'mnclliuc of the kind described. the combination with the actuating ecccntric end the Worlopertorniing element. of two norl'nnlly inoperative power transmitting elements, one being mounted on the eccentric and the other associated with the \wn'lc-por forming element, said ]7()\\6I'-t!2kll$llliitlng' elements provided with slilillllil'h' uduptcd to engage to transmit power from the actnoting means to thc work-1mrlorniino clcnicnt and automatically operable nu-uus to shift one of said clciucnts just before th W0rk-performing: element, reaches the work to cause said shoulders to engage and then-- by establish a positive connection botwcou the two.

In a machine having a work-performing element and an actuating eccentric 2L safety-link comiecting the some and courprising two parts norumlly inoperative tor tronsl'nittingg power to the Work-performiug element, one of said parts being: connected to the actuating eccentric and the otlicr to the workflier-forming clement, and uutoumtb cully operable means to shii'touc of said ports, to establish at positive connection between the two parts just prior to the en- ;rugemcut of the. work by the uwilt-performing element to rcudcr said port operative for transmitting power in the \rorlepcrloriuing element.

15. in u inechincot the kind described, the combinution with them-trotting eccentric EtlHl the work performing clemcnt oi two power trunsznittin elements, one being mounteul (m the occPntIic and the other us mciutod with the u'brk-pcrioriningr clerrient, positively zu'atin g controlling menus normuily n'iuintnining said power transmitting; elements in inoperative relation and opereble to permit of their assuming operative its opposite ends with the work-engaging element and the driving; means respectively,

l0 means to automatically lock the pawl and and means to automatically interlock said link and pawl when the path of the element V to the Workis free.

17. In a machine having a work engaging element and an anvil, means for reciprocating said element to exert pressure upon the anvil comprising an interlockin link and pawl, a cam to automatically an positively,

unlock the pawl from the link to render the work engaging element inoperative, and

point, and means to automatically unlock the link and pawl at a predetermined point to prevent workin action of the element.-

19. In a mac ine having a reciprocating work engaging element and an anvil, a drivin means, means comprising a pawl and in 1 link to connect the driving means and reciprocating work'en'gaging element, said link being a one-piece member engaging at its opposite ends with the driving means and work-engaging element respectively, and means to automatically operate the pawl to lock same with thelink to exert a. working action upon the element, and automatic means to unlock the pawl from the link.

Signed at Rochester, in the county of Monroe and State of New York, this 12th day of Sept. A. D., 1914.

EDGAR M. HAWKINS.

Witnesses:

Tnos. D. PATTON, CHESTER B. PEARSALL. 

